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        <li class="header">Part I</li>
        
        
    
        <li class="chapter " data-level="1.1" data-path="../../">
            
                <a href="../../">
            
                    
                    Introduction
            
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        </li>
    
        <li class="chapter " data-level="1.2" data-path="../C++必知必会的知识点/">
            
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                    C++必知必会的知识点
            
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                    如何成为一名合格的C/C++开发者？
            
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        <li class="chapter " data-level="1.2.2" data-path="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                <a href="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                    
                    不定参数函数实现var_arg系列的宏
            
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        </li>
    
        <li class="chapter " data-level="1.2.3" data-path="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                <a href="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                    
                    你一定要搞明白的C函数调用方式与栈原理
            
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        <li class="chapter " data-level="1.2.4" data-path="../C++必知必会的知识点/深入理解CC++中的指针.html">
            
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                    深入理解C/C++中的指针
            
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                    详解C++11中的智能指针
            
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                    C++17结构化绑定
            
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                    C++必须掌握的pimpl惯用法
            
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                <a href="../C++必知必会的知识点/用VisualStudio调试Linux程序.html">
            
                    
                    用Visual Studio调试Linux程序
            
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        <li class="chapter " data-level="1.2.9" data-path="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                <a href="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                    
                    如何使用Visual Studio管理和阅读开源项目代码
            
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        <li class="chapter " data-level="1.2.10" data-path="../C++必知必会的知识点/利用cmake工具生成VisualStudio工程文件.html">
            
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                    利用cmake工具生成Visual Studio工程文件
            
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        <li class="chapter " data-level="1.3" data-path="../多线程/">
            
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                    多线程
            
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        <li class="chapter " data-level="1.3.1" data-path="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                <a href="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                    
                    后台C++开发你一定要知道的条件变量
            
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        <li class="chapter " data-level="1.3.2" data-path="../多线程/整型变量赋值是原子操作吗？.html">
            
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                    整型变量赋值是原子操作吗？
            
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            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="2.1" data-path="../网络编程/">
            
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                    网络编程
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.1" data-path="../网络编程/bind函数重难点解析.html">
            
                <a href="../网络编程/bind函数重难点解析.html">
            
                    
                    bind 函数重难点解析
            
                </a>
            

            
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        <li class="chapter " data-level="2.1.2" data-path="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                <a href="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                    
                    connect 函数在阻塞和非阻塞模式下的行为
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3" data-path="../网络编程/select函数重难点解析.html">
            
                <a href="../网络编程/select函数重难点解析.html">
            
                    
                    select 函数重难点解析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4" data-path="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                <a href="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                    
                    Linux epoll 模型（含LT 模式和 ET 模式详解）
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5" data-path="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                <a href="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                    
                    socket 的阻塞模式和非阻塞模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.6" data-path="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                <a href="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                    
                    非阻塞模式下 send 和 recv 函数的返回值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.7" data-path="../网络编程/服务器开发通信协议设计介绍.html">
            
                <a href="../网络编程/服务器开发通信协议设计介绍.html">
            
                    
                    服务器开发通信协议设计介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.8" data-path="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                <a href="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                    
                    TCP 协议如何解决粘包、半包问题
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.9" data-path="../网络编程/网络通信中收发数据的正确姿势.html">
            
                <a href="../网络编程/网络通信中收发数据的正确姿势.html">
            
                    
                    网络通信中收发数据的正确姿势
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.10" data-path="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                <a href="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                    
                    服务器端发数据时，如果对端一直不收，怎么办？
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="3.1" data-path="../程序员必知必会的网络命令/">
            
                <a href="../程序员必知必会的网络命令/">
            
                    
                    程序员必知必会的网络命令
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.1.1" data-path="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                <a href="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                    
                    利用telnet命令发电子邮件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.2" data-path="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                <a href="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                    
                    做Java或者C++开发都应该知道的lsof命令
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.3" data-path="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                <a href="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                    
                    Linux网络故障排查的瑞士军刀nc命令
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.4" data-path="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                <a href="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                    
                    Linux tcpdump使用详解
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.5" data-path="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                <a href="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                    
                    从抓包的角度分析connect函数的连接过程
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.6" data-path="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                <a href="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                    
                    服务器开发中网络数据分析与故障排查经验漫谈
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part II</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../高性能服务器框架设计/">
            
                <a href="../高性能服务器框架设计/">
            
                    
                    高性能服务器框架设计
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="4.1.1" data-path="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                <a href="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                    
                    主线程与工作线程的分工
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.2" data-path="../高性能服务器框架设计/Reactor模式.html">
            
                <a href="../高性能服务器框架设计/Reactor模式.html">
            
                    
                    Reactor模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.3" data-path="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                <a href="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                    
                    实例：一个服务器程序的架构介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.4" data-path="../高性能服务器框架设计/错误码系统的设计.html">
            
                <a href="../高性能服务器框架设计/错误码系统的设计.html">
            
                    
                    错误码系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.5" data-path="../高性能服务器框架设计/日志系统的设计.html">
            
                <a href="../高性能服务器框架设计/日志系统的设计.html">
            
                    
                    日志系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.6" data-path="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                <a href="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                    
                    如何设计断线自动重连机制
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.7" data-path="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                <a href="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                    
                    心跳包机制设计详解
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.8" data-path="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                <a href="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                    
                    业务数据处理一定要单独开线程吗
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.9" data-path="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                <a href="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                    
                    C++ 高性能服务器网络框架设计细节
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="5.1" data-path="../服务器开发案例实战/">
            
                <a href="../服务器开发案例实战/">
            
                    
                    服务器开发案例实战
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.1.1" data-path="../服务器开发案例实战/从零实现一个http服务器.html">
            
                <a href="../服务器开发案例实战/从零实现一个http服务器.html">
            
                    
                    从零实现一个http服务器
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.2" data-path="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                <a href="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                    
                    从零实现一款12306刷票软件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.3" data-path="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                <a href="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                    
                    从零实现一个邮件收发客户端
            
                </a>
            

            
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        <li class="chapter " data-level="5.1.4" data-path="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                <a href="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                    
                    从零开发一个WebSocket服务器
            
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        <li class="chapter " data-level="5.1.5" data-path="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                <a href="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                    
                    从零学习开源项目系列（一） 从一款多人联机实时对战游戏开始
            
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        <li class="chapter " data-level="5.1.6" data-path="../服务器开发案例实战/2最后一战概况.html">
            
                <a href="../服务器开发案例实战/2最后一战概况.html">
            
                    
                    从零学习开源项目系列（二） 最后一战概况
            
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        <li class="chapter " data-level="5.1.7" data-path="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                <a href="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                    
                    从零学习开源项目系列（三） CSBattleMgr服务源码研究
            
                </a>
            

            
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        <li class="chapter " data-level="5.1.8" data-path="../服务器开发案例实战/4LogServer源码探究.html">
            
                <a href="../服务器开发案例实战/4LogServer源码探究.html">
            
                    
                    从零学习开源项目系列（四）LogServer源码探究
            
                </a>
            

            
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            </ul>
            
        </li>
    

    
        
        <li class="header">Part III</li>
        
        
    
        <li class="chapter " data-level="6.1" data-path="../TeamTalk源码解析/">
            
                <a href="../TeamTalk源码解析/">
            
                    
                    TeamTalk IM源码分析
            
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        <li class="chapter " data-level="6.1.1" data-path="../TeamTalk源码解析/01TeamTalk介绍.html">
            
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                    01 TeamTalk介绍
            
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        <li class="chapter " data-level="6.1.2" data-path="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                <a href="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                    
                    02 服务器端的程序的编译与部署
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.3" data-path="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
            
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                    03 服务器端的程序架构介绍
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.4" data-path="../TeamTalk源码解析/04服务器端db_proxy_server源码分析.html">
            
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                    04 服务器端db_proxy_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.5" data-path="../TeamTalk源码解析/05服务器端msg_server源码分析.html">
            
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                    05 服务器端msg_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.6" data-path="../TeamTalk源码解析/06服务器端login_server源码分析.html">
            
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                    06 服务器端login_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.7" data-path="../TeamTalk源码解析/07服务器端msfs源码分析.html">
            
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                    07 服务器端msfs源码分析
            
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        <li class="chapter " data-level="6.1.8" data-path="../TeamTalk源码解析/08服务器端file_server源码分析.html">
            
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                    08 服务器端file_server源码分析
            
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        <li class="chapter " data-level="6.1.9" data-path="../TeamTalk源码解析/09服务器端route_server源码分析.html">
            
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                    09 服务器端route_server源码分析
            
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        <li class="chapter " data-level="6.1.10" data-path="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                <a href="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                    
                    10 开放一个TeamTalk测试服务器地址和几个测试账号
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.11" data-path="../TeamTalk源码解析/11pc客户端源码分析.html">
            
                <a href="../TeamTalk源码解析/11pc客户端源码分析.html">
            
                    
                    11 pc客户端源码分析
            
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        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="7.1" data-path="../libevent源码深度剖析/">
            
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                    libevent源码深度剖析
            
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                    libevent源码深度剖析01
            
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        <li class="chapter " data-level="7.1.2" data-path="../libevent源码深度剖析/libevent源码深度剖析02.html">
            
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                    libevent源码深度剖析02
            
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        <li class="chapter " data-level="7.1.3" data-path="../libevent源码深度剖析/libevent源码深度剖析03.html">
            
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                    libevent源码深度剖析03
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.4" data-path="../libevent源码深度剖析/libevent源码深度剖析04.html">
            
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                    libevent源码深度剖析04
            
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        <li class="chapter " data-level="7.1.5" data-path="../libevent源码深度剖析/libevent源码深度剖析05.html">
            
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                    libevent源码深度剖析05
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.6" data-path="../libevent源码深度剖析/libevent源码深度剖析06.html">
            
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                    libevent源码深度剖析06
            
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        <li class="chapter " data-level="7.1.7" data-path="../libevent源码深度剖析/libevent源码深度剖析07.html">
            
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                    libevent源码深度剖析07
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.8" data-path="../libevent源码深度剖析/libevent源码深度剖析08.html">
            
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                    libevent源码深度剖析08
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.9" data-path="../libevent源码深度剖析/libevent源码深度剖析09.html">
            
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                    libevent源码深度剖析09
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.10" data-path="../libevent源码深度剖析/libevent源码深度剖析10.html">
            
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                    libevent源码深度剖析10
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.11" data-path="../libevent源码深度剖析/libevent源码深度剖析11.html">
            
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                    libevent源码深度剖析11
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.1.12" data-path="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                <a href="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                    
                    libevent源码深度剖析12
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.13" data-path="../libevent源码深度剖析/libevent源码深度剖析13.html">
            
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                    libevent源码深度剖析13
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="7.2" data-path="./">
            
                <a href="./">
            
                    
                    leveldb源码分析
            
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        <li class="chapter " data-level="7.2.1" data-path="leveldb源码分析1.html">
            
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                    leveldb源码分析1
            
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        <li class="chapter " data-level="7.2.2" data-path="leveldb源码分析2.html">
            
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                    leveldb源码分析2
            
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        <li class="chapter " data-level="7.2.3" data-path="leveldb源码分析3.html">
            
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                    leveldb源码分析3
            
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        <li class="chapter " data-level="7.2.4" data-path="leveldb源码分析4.html">
            
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                    leveldb源码分析4
            
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        </li>
    
        <li class="chapter " data-level="7.2.5" data-path="leveldb源码分析5.html">
            
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                    leveldb源码分析5
            
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        </li>
    
        <li class="chapter " data-level="7.2.6" data-path="leveldb源码分析6.html">
            
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                    leveldb源码分析6
            
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        </li>
    
        <li class="chapter " data-level="7.2.7" data-path="leveldb源码分析7.html">
            
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                    leveldb源码分析7
            
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        </li>
    
        <li class="chapter " data-level="7.2.8" data-path="leveldb源码分析8.html">
            
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                    leveldb源码分析8
            
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        </li>
    
        <li class="chapter " data-level="7.2.9" data-path="leveldb源码分析9.html">
            
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                    leveldb源码分析9
            
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        </li>
    
        <li class="chapter " data-level="7.2.10" data-path="leveldb源码分析10.html">
            
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                    leveldb源码分析10
            
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        <li class="chapter " data-level="7.2.11" data-path="leveldb源码分析11.html">
            
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                    leveldb源码分析11
            
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        <li class="chapter " data-level="7.2.12" data-path="leveldb源码分析12.html">
            
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                    leveldb源码分析12
            
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        <li class="chapter active" data-level="7.2.13" data-path="leveldb源码分析13.html">
            
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                    leveldb源码分析13
            
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        <li class="chapter " data-level="7.2.14" data-path="leveldb源码分析14.html">
            
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                    leveldb源码分析14
            
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        <li class="chapter " data-level="7.2.15" data-path="leveldb源码分析15.html">
            
                <a href="leveldb源码分析15.html">
            
                    
                    leveldb源码分析15
            
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        <li class="chapter " data-level="7.2.16" data-path="leveldb源码分析16.html">
            
                <a href="leveldb源码分析16.html">
            
                    
                    leveldb源码分析16
            
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        <li class="chapter " data-level="7.2.17" data-path="leveldb源码分析17.html">
            
                <a href="leveldb源码分析17.html">
            
                    
                    leveldb源码分析17
            
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        <li class="chapter " data-level="7.2.18" data-path="leveldb源码分析18.html">
            
                <a href="leveldb源码分析18.html">
            
                    
                    leveldb源码分析18
            
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        <li class="chapter " data-level="7.2.19" data-path="leveldb源码分析19.html">
            
                <a href="leveldb源码分析19.html">
            
                    
                    leveldb源码分析19
            
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        <li class="chapter " data-level="7.2.20" data-path="leveldb源码分析20.html">
            
                <a href="leveldb源码分析20.html">
            
                    
                    leveldb源码分析20
            
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        </li>
    
        <li class="chapter " data-level="7.2.21" data-path="leveldb源码分析21.html">
            
                <a href="leveldb源码分析21.html">
            
                    
                    leveldb源码分析21
            
                </a>
            

            
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        <li class="chapter " data-level="7.2.22" data-path="leveldb源码分析22.html">
            
                <a href="leveldb源码分析22.html">
            
                    
                    leveldb源码分析22
            
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            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="8.1" data-path="../Memcached源码分析/">
            
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                    Memcached源码分析
            
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        <li class="chapter " data-level="8.1.1" data-path="../Memcached源码分析/00服务器资源调整.html">
            
                <a href="../Memcached源码分析/00服务器资源调整.html">
            
                    
                    00 服务器资源调整
            
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        <li class="chapter " data-level="8.1.2" data-path="../Memcached源码分析/01初始化参数解析.html">
            
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                    01 初始化参数解析
            
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        <li class="chapter " data-level="8.1.3" data-path="../Memcached源码分析/02网络监听的建立.html">
            
                <a href="../Memcached源码分析/02网络监听的建立.html">
            
                    
                    02 网络监听的建立
            
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        <li class="chapter " data-level="8.1.4" data-path="../Memcached源码分析/03网络连接建立.html">
            
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                    03 网络连接建立
            
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        <li class="chapter " data-level="8.1.5" data-path="../Memcached源码分析/04内存初始化.html">
            
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                    04 内存初始化
            
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        <li class="chapter " data-level="8.1.6" data-path="../Memcached源码分析/05资源初始化.html">
            
                <a href="../Memcached源码分析/05资源初始化.html">
            
                    
                    05 资源初始化
            
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        <li class="chapter " data-level="8.1.7" data-path="../Memcached源码分析/06get过程.html">
            
                <a href="../Memcached源码分析/06get过程.html">
            
                    
                    06 get过程
            
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        <li class="chapter " data-level="8.1.8" data-path="../Memcached源码分析/07cas属性.html">
            
                <a href="../Memcached源码分析/07cas属性.html">
            
                    
                    07 cas属性
            
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        <li class="chapter " data-level="8.1.9" data-path="../Memcached源码分析/08内存池.html">
            
                <a href="../Memcached源码分析/08内存池.html">
            
                    
                    08 内存池
            
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        <li class="chapter " data-level="8.1.10" data-path="../Memcached源码分析/09连接队列.html">
            
                <a href="../Memcached源码分析/09连接队列.html">
            
                    
                    09 连接队列
            
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        <li class="chapter " data-level="8.1.11" data-path="../Memcached源码分析/10Hash表操作.html">
            
                <a href="../Memcached源码分析/10Hash表操作.html">
            
                    
                    10 Hash表操作
            
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        <li class="chapter " data-level="8.1.12" data-path="../Memcached源码分析/12set操作.html">
            
                <a href="../Memcached源码分析/12set操作.html">
            
                    
                    12 set操作
            
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        <li class="chapter " data-level="8.1.13" data-path="../Memcached源码分析/13do_item_alloc操作.html">
            
                <a href="../Memcached源码分析/13do_item_alloc操作.html">
            
                    
                    13 do_item_alloc操作
            
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        <li class="chapter " data-level="8.1.14" data-path="../Memcached源码分析/14item结构.html">
            
                <a href="../Memcached源码分析/14item结构.html">
            
                    
                    14 item结构
            
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        <li class="chapter " data-level="8.1.15" data-path="../Memcached源码分析/15Hash表扩容.html">
            
                <a href="../Memcached源码分析/15Hash表扩容.html">
            
                    
                    15 Hash表扩容
            
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        <li class="chapter " data-level="8.1.16" data-path="../Memcached源码分析/16线程交互.html">
            
                <a href="../Memcached源码分析/16线程交互.html">
            
                    
                    16 线程交互
            
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        <li class="chapter " data-level="8.1.17" data-path="../Memcached源码分析/17状态机.html">
            
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                    17 状态机
            
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        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="9.1" data-path="../游戏开发专题/">
            
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                    游戏开发专题
            
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                    1 游戏服务器开发的基本体系与服务器端开发的一些建议
            
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        <li class="chapter " data-level="9.1.2" data-path="../游戏开发专题/2网络游戏服务器开发框架设计介绍.html">
            
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                    2 网络游戏服务器开发框架设计介绍
            
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        <li class="chapter " data-level="9.1.3" data-path="../游戏开发专题/3游戏后端开发需要掌握的知识.html">
            
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                    3 游戏后端开发需要掌握的知识
            
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        <li class="chapter " data-level="9.1.4" data-path="../游戏开发专题/4关于游戏服务端架构的整理.html">
            
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                    4 关于游戏服务端架构的整理
            
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        <li class="chapter " data-level="9.1.5" data-path="../游戏开发专题/5各类游戏对应的服务端架构.html">
            
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                    5 各类游戏对应的服务端架构
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.6" data-path="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
            
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                    6 从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.7" data-path="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
            
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                    7 QQ游戏百万人同时在线服务器架构实现
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.8" data-path="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
            
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                    8 大型多人在线游戏服务器架构设计
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.9" data-path="../游戏开发专题/9百万用户级游戏服务器架构设计.html">
            
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                    9 百万用户级游戏服务器架构设计
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.10" data-path="../游戏开发专题/10十万在线的WebGame的数据库设计思路.html">
            
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                    10 十万在线的WebGame的数据库设计思路
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.11" data-path="../游戏开发专题/11一种高性能网络游戏服务器架构设计.html">
            
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                    11 一种高性能网络游戏服务器架构设计
            
                </a>
            

            
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                    12 经典游戏服务器端架构概述
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.13" data-path="../游戏开发专题/13游戏跨服架构进化之路.html">
            
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                    13 游戏跨服架构进化之路
            
                </a>
            

            
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            </ul>
            
        </li>
    

    
        
        <li class="header">Part IV</li>
        
        
    
        <li class="chapter " data-level="10.1" data-path="../程序员面试题精讲/">
            
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                    腾讯后台开发实习生技能要求
            
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                    聊聊如何拿大厂的 offer
            
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                    聊聊技术人员的常见的职业问题
            
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        <li class="chapter " data-level="10.2.3" data-path="../职业规划/写给那些傻傻想做服务器开发的朋友.html">
            
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                    写给那些傻傻想做服务器开发的朋友
            
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        <li class="chapter " data-level="10.3" data-path="../自我提升与开源代码/">
            
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                    自我提升与开源代码
            
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                    2020 年好好读一读开源代码吧
            
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                    后端开发相关的书籍
            
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        <li class="chapter " data-level="10.4.1" data-path="../后端开发相关的书籍/后台开发应该读的书.html">
            
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        <li class="chapter " data-level="10.5" data-path="../程序员的简历/">
            
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                    程序员的简历
            
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                    程序员的薪资与年终奖那些事儿
            
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        <li class="chapter " data-level="10.6.1" data-path="../程序员的薪资与年终奖那些事儿/技术面试与HR谈薪资技巧.html">
            
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        <li class="chapter " data-level="10.6.3" data-path="../程序员的薪资与年终奖那些事儿/谈一谈年终奖.html">
            
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                    谈一谈年终奖
            
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                    程序员的烦心事
            
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                    作者的故事
            
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                    我的 2019
            
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                    我是如何年薪五十万的
            
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<h2 id="8filterpolicybloom&#x4E4B;&#x4E8C;"><a name="8filterpolicybloom&#x4E4B;&#x4E8C;" class="anchor-navigation-ex-anchor" href="#8filterpolicybloom&#x4E4B;&#x4E8C;"><i class="fa fa-link" aria-hidden="true"></i></a>8.FilterPolicy&amp;Bloom&#x4E4B;&#x4E8C;</h2>
<h3 id="85-&#x6784;&#x5EFA;filterblock"><a name="85-&#x6784;&#x5EFA;filterblock" class="anchor-navigation-ex-anchor" href="#85-&#x6784;&#x5EFA;filterblock"><i class="fa fa-link" aria-hidden="true"></i></a>8.5 &#x6784;&#x5EFA;FilterBlock</h3>
<h4 id="851-filterblockbuilder"><a name="851-filterblockbuilder" class="anchor-navigation-ex-anchor" href="#851-filterblockbuilder"><i class="fa fa-link" aria-hidden="true"></i></a>8.5.1 FilterBlockBuilder</h4>
<p>&#x4E86;&#x89E3;&#x4E86;filter&#x673A;&#x5236;&#xFF0C;&#x73B0;&#x5728;&#x6765;&#x770B;&#x770B;<strong>filter block&#x7684;&#x6784;&#x5EFA;</strong>&#xFF0C;&#x8FD9;&#x5C31;&#x662F;&#x7C7B;FilterBlockBuilder&#x3002;&#x5B83;&#x4E3A;&#x6307;&#x5B9A;&#x7684;table&#x6784;&#x5EFA;&#x6240;&#x6709;&#x7684;filter&#xFF0C;&#x7ED3;&#x679C;&#x662F;&#x4E00;&#x4E2A;string&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x5E76;&#x4F5C;&#x4E3A;&#x4E00;&#x4E2A;block&#x5B58;&#x653E;&#x5728;table&#x4E2D;&#x3002;&#x5B83;&#x6709;&#x4E09;&#x4E2A;&#x51FD;&#x6570;&#x63A5;&#x53E3;&#xFF1A;</p>
<pre class="language-"><code>// &#x5F00;&#x59CB;&#x6784;&#x5EFA;&#x65B0;&#x7684;filter block&#xFF0C;TableBuilder&#x5728;&#x6784;&#x9020;&#x51FD;&#x6570;&#x548C;Flush&#x4E2D;&#x8C03;&#x7528;  

void StartBlock(uint64_tblock_offset);  

// &#x6DFB;&#x52A0;key&#xFF0C;TableBuilder&#x6BCF;&#x6B21;&#x5411;data block&#x4E2D;&#x52A0;&#x5165;key&#x65F6;&#x8C03;&#x7528;  

void AddKey(const Slice&amp;key);  

// &#x7ED3;&#x675F;&#x6784;&#x5EFA;&#xFF0C;TableBuilder&#x5728;&#x7ED3;&#x675F;&#x5BF9;table&#x7684;&#x6784;&#x5EFA;&#x65F6;&#x8C03;&#x7528;  

Slice Finish();
</code></pre><p><strong>FilterBlockBuilder&#x7684;&#x6784;&#x5EFA;&#x987A;&#x5E8F;</strong>&#x5FC5;&#x987B;&#x6EE1;&#x8DB3;&#x5982;&#x4E0B;&#x8303;&#x5F0F;&#xFF1A;<code>(StartBlock AddKey*)* Finish</code>&#xFF0C;&#x663E;&#x7136;&#x8FD9;&#x548C;&#x524D;&#x9762;&#x8BB2;&#x8FC7;&#x7684;BlockBuilder&#x6709;&#x6240;&#x4E0D;&#x540C;&#x3002;
&#x5176;&#x6210;&#x5458;&#x53D8;&#x91CF;&#x6709;&#xFF1A;</p>
<pre class="language-"><code>const FilterPolicy* policy_; // filter&#x7C7B;&#x578B;&#xFF0C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x53C2;&#x6570;&#x6307;&#x5B9A;  

std::string keys_;          //Flattened key contents  

std::vector<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>size_t</span><span class="token punctuation">&gt;</span></span> start_; // &#x5404;key&#x5728;keys_&#x4E2D;&#x7684;&#x4F4D;&#x7F6E;  

std::string result_;        // &#x5F53;&#x524D;&#x8BA1;&#x7B97;&#x51FA;&#x7684;filter data  

std::vector<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>uint32_t</span><span class="token punctuation">&gt;</span></span>filter_offsets_; // &#x5404;&#x4E2A;filter&#x5728;result_&#x4E2D;&#x7684;&#x4F4D;&#x7F6E;  

std::vector<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>Slice</span><span class="token punctuation">&gt;</span></span> tmp_keys_;// policy_-&gt;CreateFilter()&#x53C2;&#x6570;
</code></pre><p>&#x524D;&#x9762;&#x8BF4;&#x8FC7;base&#x662F;2KB&#xFF0C;&#x8FD9;&#x5BF9;&#x5E94;&#x4E24;&#x4E2A;&#x5E38;&#x91CF;<code>kFilterBase =11, kFilterBase =(1&lt;&lt;kFilterBaseLg)&#xFF1B;</code>&#x5176;&#x5B9E;&#x4ECE;&#x540E;&#x9762;&#x7684;&#x5B9E;&#x73B0;&#x6765;&#x770B;tmp<em>keys</em>&#x5B8C;&#x5168;&#x4E0D;&#x5FC5;&#x4F5C;&#x4E3A;&#x6210;&#x5458;&#x53D8;&#x91CF;&#xFF0C;&#x76F4;&#x63A5;&#x4F5C;&#x4E3A;&#x51FD;&#x6570;GenerateFilter()&#x7684;&#x6808;&#x53D8;&#x91CF;&#x5C31;&#x53EF;&#x4EE5;&#x3002;&#x4E0B;&#x9762;&#x5C31;&#x5206;&#x522B;&#x5206;&#x6790;&#x4E09;&#x4E2A;&#x51FD;&#x6570;&#x63A5;&#x53E3;&#x3002;</p>
<h4 id="852-filterblockbuilderstartblock"><a name="852-filterblockbuilderstartblock" class="anchor-navigation-ex-anchor" href="#852-filterblockbuilderstartblock"><i class="fa fa-link" aria-hidden="true"></i></a>8.5.2 FilterBlockBuilder::StartBlock()</h4>
<p>&#x5B83;&#x6839;&#x636E;&#x53C2;&#x6570;block_offset&#x8BA1;&#x7B97;&#x51FA;filter index&#xFF0C;&#x7136;&#x540E;&#x5FAA;&#x73AF;&#x8C03;&#x7528;GenerateFilter&#x751F;&#x4EA7;&#x65B0;&#x7684;Filter&#x3002;</p>
<pre class="language-"><code>uint64_t filter_index =(block_offset / kFilterBase);  

assert(filter_index &gt;=filter_offsets_.size());  

while (filter_index &gt;filter_offsets_.size()) GenerateFilter();
</code></pre><p>&#x6211;&#x4EEC;&#x6765;&#x5230;GenerateFilter&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x770B;&#x770B;&#x5B83;&#x7684;&#x903B;&#x8F91;&#x3002;</p>
<pre class="language-"><code>//S1 &#x5982;&#x679C;filter&#x4E2D;key&#x4E2A;&#x6570;&#x4E3A;0&#xFF0C;&#x5219;&#x76F4;&#x63A5;&#x538B;&#x5165;result_.size()&#x5E76;&#x8FD4;&#x56DE;  

  const size_t num_keys =start_.size();  

  if (num_keys == 0) { // there are no keys for this filter  

    filter_offsets_.push_back(result_.size()); //result_.size()&#x5E94;&#x8BE5;&#x662F;0  

    return;  

  }  

//S2 &#x4ECE;key&#x521B;&#x5EFA;&#x4E34;&#x65F6;key list&#xFF0C;&#x6839;&#x636E;key&#x7684;&#x5E8F;&#x5217;&#x5B57;&#x7B26;&#x4E32;kyes_&#x548C;&#x5404;key&#x5728;keys_
//&#x4E2D;&#x7684;&#x5F00;&#x59CB;&#x4F4D;&#x7F6E;start_&#x4F9D;&#x6B21;&#x63D0;&#x53D6;&#x51FA;key&#x3002;  

  start_.push_back(keys_.size());  // Simplify lengthcomputation  

  tmp_keys_.resize(num_keys);  

  for (size_t i = 0; i &lt;num_keys; i++) {  

    const char* base =keys_.data() + start_[i]; // &#x5F00;&#x59CB;&#x6307;&#x9488;  

    size_t length = start_[i+1] -start_[i]; // &#x957F;&#x5EA6;  

    tmp_keys_[i] = Slice(base,length);  

  }  

//S3 &#x4E3A;&#x5F53;&#x524D;&#x7684;key&#x96C6;&#x5408;&#x751F;&#x4EA7;filter&#xFF0C;&#x5E76;append&#x5230;result_  

filter_offsets_.push_back(result_.size());  

policy_-&gt;CreateFilter(&amp;tmp_keys_[0], num_keys, &amp;result_);  

//S4 &#x6E05;&#x7A7A;&#xFF0C;&#x91CD;&#x7F6E;&#x72B6;&#x6001;  

tmp_keys_.clear();  

keys_.clear();  

start_.clear();
</code></pre><h4 id="853-filterblockbuilderaddkey"><a name="853-filterblockbuilderaddkey" class="anchor-navigation-ex-anchor" href="#853-filterblockbuilderaddkey"><i class="fa fa-link" aria-hidden="true"></i></a>8.5.3 FilterBlockBuilder::AddKey()</h4>
<p>&#x8FD9;&#x4E2A;&#x63A5;&#x53E3;&#x5F88;&#x7B80;&#x5355;&#xFF0C;&#x5C31;&#x662F;&#x628A;key&#x6DFB;&#x52A0;&#x5230;key<em>&#x4E2D;&#xFF0C;&#x5E76;&#x5728;start</em>&#x4E2D;&#x8BB0;&#x5F55;&#x4F4D;&#x7F6E;&#x3002;</p>
<pre class="language-"><code>Slice k = key;  

start_.push_back(keys_.size());  

keys_.append(k.data(),k.size());
</code></pre><h4 id="854-filterblockbuilderfinish"><a name="854-filterblockbuilderfinish" class="anchor-navigation-ex-anchor" href="#854-filterblockbuilderfinish"><i class="fa fa-link" aria-hidden="true"></i></a>8.5.4 FilterBlockBuilder::Finish()</h4>
<p>&#x8C03;&#x7528;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#x8BF4;&#x660E;&#x6574;&#x4E2A;table&#x7684;data block&#x5DF2;&#x7ECF;&#x6784;&#x5EFA;&#x5B8C;&#x4E86;&#xFF0C;&#x53EF;&#x4EE5;&#x751F;&#x4EA7;&#x6700;&#x7EC8;&#x7684;filter block&#x4E86;&#xFF0C;&#x5728;TableBuilder::Finish&#x51FD;&#x6570;&#x4E2D;&#x88AB;&#x8C03;&#x7528;&#xFF0C;&#x5411;sstable&#x5199;&#x5165;meta block&#x3002;
&#x51FD;&#x6570;&#x903B;&#x8F91;&#x4E3A;&#xFF1A;</p>
<pre class="language-"><code>//S1 &#x5982;&#x679C;start_&#x6570;&#x5B57;&#x4E0D;&#x7A7A;&#xFF0C;&#x628A;&#x4E3A;&#x7684;key&#x5217;&#x8868;&#x751F;&#x4EA7;filter  

  if (!start_.empty()) GenerateFilter();  

//S2 &#x4ECE;0&#x5F00;&#x59CB;&#x987A;&#x5E8F;&#x5B58;&#x50A8;&#x5404;filter&#x7684;&#x504F;&#x79FB;&#x503C;&#xFF0C;&#x89C1;filter block data&#x7684;&#x6570;&#x636E;&#x683C;&#x5F0F;&#x3002;  

  const uint32_t array_offset =result_.size();  

  for (size_t i = 0; i &lt; filter_offsets_.size();i++) {  

    PutFixed32(&amp;result_,filter_offsets_[i]);  

  }  

//S3 &#x6700;&#x540E;&#x662F;filter&#x4E2A;&#x6570;&#xFF0C;&#x548C;shift&#x5E38;&#x91CF;&#xFF08;11&#xFF09;&#xFF0C;&#x5E76;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;  

  PutFixed32(&amp;result_,array_offset);  

  result_.push_back(kFilterBaseLg);  // Save encoding parameter in result  

  return Slice(result_);
</code></pre><h4 id="855-&#x7B80;&#x5355;&#x793A;&#x4F8B;"><a name="855-&#x7B80;&#x5355;&#x793A;&#x4F8B;" class="anchor-navigation-ex-anchor" href="#855-&#x7B80;&#x5355;&#x793A;&#x4F8B;"><i class="fa fa-link" aria-hidden="true"></i></a>8.5.5 &#x7B80;&#x5355;&#x793A;&#x4F8B;</h4>
<p>&#x8BA9;&#x6211;&#x4EEC;&#x6839;&#x636E;TableBuilder&#x5BF9;FilterBlockBuilder&#x63A5;&#x53E3;&#x7684;&#x8C03;&#x7528;&#x8303;&#x5F0F;&#xFF1A;
(StartBlock AddKey<em>)</em> Finish&#x4EE5;&#x53CA;&#x4E0A;&#x9762;&#x7684;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#xFF0C;&#x7ED3;&#x5408;&#x4E00;&#x4E2A;&#x7B80;&#x5355;&#x4F8B;&#x5B50;&#x770B;&#x770B;<strong>leveldb&#x662F;&#x5982;&#x4F55;&#x4E3A;data block&#x521B;&#x5EFA;filter block&#xFF08;&#x4E5F;&#x5C31;&#x662F;meta block&#xFF09;&#x7684;&#x3002;</strong>
&#x8003;&#x8651;&#x4E24;&#x4E2A;datablock&#xFF0C;&#x5728;sstable&#x7684;&#x8303;&#x56F4;&#x5206;&#x522B;&#x662F;&#xFF1A;<code>Block 1 [0, 7KB-1], Block 2 [7KB, 14.1KB]</code></p>
<ul>
<li><p>S1 &#x9996;&#x5148;TableBuilder&#x4E3A;Block 1&#x8C03;&#x7528;FilterBlockBuilder::StartBlock(0)&#xFF0C;&#x8BE5;&#x51FD;&#x6570;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#xFF1B;</p>
</li>
<li><p>S2 &#x7136;&#x540E;&#x4F9D;&#x6B21;&#x5411;Block 1&#x52A0;&#x5165;k/v&#xFF0C;&#x5176;&#x4E2D;&#x4F1A;&#x8C03;&#x7528;FilterBlockBuilder::AddKey&#xFF0C;FilterBlockBuilder&#x8BB0;&#x5F55;&#x8FD9;&#x4E9B;key&#x3002;</p>
</li>
<li><p>S3 &#x4E0B;&#x4E00;&#x6B21;TableBuilder&#x6DFB;&#x52A0;k/v&#x65F6;&#xFF0C;&#x4F8B;&#x884C;&#x68C0;&#x67E5;&#x53D1;&#x73B0;Block 1&#x7684;&#x5927;&#x5C0F;&#x8D85;&#x8FC7;&#x8BBE;&#x7F6E;&#xFF0C;&#x5219;&#x6267;&#x884C;Flush&#x64CD;&#x4F5C;&#xFF0C;Flush&#x64CD;&#x4F5C;&#x5728;&#x5199;&#x5165;Block 1&#x540E;&#xFF0C;&#x5F00;&#x59CB;&#x51C6;&#x5907;Block 2&#x5E76;&#x66F4;&#x65B0;block offset=7KB&#xFF0C;&#x6700;&#x540E;&#x8C03;&#x7528;FilterBlockBuilder::StartBlock(7KB)&#xFF0C;&#x5F00;&#x59CB;&#x4E3A;Block 2&#x6784;&#x5EFA;Filter&#x3002;</p>
</li>
<li><p>S4 &#x5728;FilterBlockBuilder::StartBlock(7KB)&#x4E2D;&#xFF0C;&#x8BA1;&#x7B97;&#x51FA;filter index = 3&#xFF0C;&#x89E6;&#x53D1;3&#x6B21;GenerateFilter&#x51FD;&#x6570;&#xFF0C;&#x4E3A;Block 1&#x6DFB;&#x52A0;&#x7684;&#x90A3;&#x4E9B;key&#x5217;&#x8868;&#x521B;&#x5EFA;filter&#xFF0C;&#x5176;&#x4E2D;&#x7B2C;2&#x3001;3&#x6B21;&#x5FAA;&#x73AF;&#x521B;&#x5EFA;&#x7684;&#x662F;&#x7A7A;filter&#x3002;&#x6B64;&#x65F6;filter&#x7684;&#x7ED3;&#x6784;&#x5982;&#x56FE;8.5-1&#x6240;&#x793A;&#x3002;<img src="" alt="img"></p>
<p>  &#x56FE;8.5-1</p>
<p>  &#x5728;StartBlock(7KB)&#x65F6;&#x4F1A;&#x5411;filter&#x7684;&#x504F;&#x79FB;&#x6570;&#x7EC4;filter<em>offsets</em>&#x538B;&#x5165;&#x4E24;&#x4E2A;&#x5305;&#x542B;&#x7A7A;key set&#x7684;&#x5143;&#x7D20;&#xFF0C;filter<em>offsets</em>[1]&#x548C;filter<em>offsets</em>[2]&#xFF0C;&#x5B83;&#x4EEC;&#x7684;&#x503C;&#x90FD;&#x7B49;&#x4E8E;7KB-1&#x3002;</p>
</li>
<li><p>S5Block 2&#x6784;&#x5EFA;&#x7ED3;&#x675F;&#xFF0C;TableBuilder&#x8C03;&#x7528;Finish&#x7ED3;&#x675F;table&#x7684;&#x6784;&#x5EFA;&#xFF0C;&#x8FD9;&#x4F1A;&#x518D;&#x6B21;&#x89E6;&#x53D1;Flush&#x64CD;&#x4F5C;&#xFF0C;&#x5728;&#x5199;&#x5165;Block 2&#x540E;&#xFF0C;&#x4E3A;Block 2&#x7684;key&#x521B;&#x5EFA;filter&#x3002;&#x6700;&#x7EC8;&#x7684;filter&#x5982;&#x56FE;8.5-2&#x6240;&#x793A;&#x3002;<img src="" alt="img"></p>
<p>  &#x56FE;8.5-2</p>
</li>
<li><p>&#x8FD9;&#x91CC;&#x5982;&#x679C;Block 1&#x7684;&#x8303;&#x56F4;&#x662F;[0, 1.8KB-1]&#xFF0C;Block 2&#x4ECE;1.8KB&#x5F00;&#x59CB;&#xFF0C;&#x90A3;&#x4E48;Block 2&#x5C06;&#x4F1A;&#x548C;Block 1&#x5171;&#x7528;&#x4E00;&#x4E2A;filter&#xFF0C;&#x5B83;&#x4EEC;&#x7684;filter&#x90FD;&#x88AB;&#x751F;&#x6210;&#x5230;filter 0&#x4E2D;&#x3002;
  &#x5F53;&#x7136;&#x5728;TableBuilder&#x6784;&#x5EFA;&#x8868;&#x65F6;&#xFF0C;Block&#x7684;&#x5927;&#x5C0F;&#x662F;&#x6839;&#x636E;&#x53C2;&#x6570;&#x914D;&#x7F6E;&#x7684;&#xFF0C;&#x4E5F;&#x662F;&#x57FA;&#x672C;&#x5747;&#x5300;&#x7684;&#x3002;</p>
</li>
</ul>
<h3 id="86-&#x8BFB;&#x53D6;filterblock"><a name="86-&#x8BFB;&#x53D6;filterblock" class="anchor-navigation-ex-anchor" href="#86-&#x8BFB;&#x53D6;filterblock"><i class="fa fa-link" aria-hidden="true"></i></a>8.6 &#x8BFB;&#x53D6;FilterBlock</h3>
<h4 id="861-filterblockreader"><a name="861-filterblockreader" class="anchor-navigation-ex-anchor" href="#861-filterblockreader"><i class="fa fa-link" aria-hidden="true"></i></a>8.6.1 FilterBlockReader</h4>
<p>FilterBlock&#x7684;&#x8BFB;&#x53D6;&#x64CD;&#x4F5C;&#x5728;FilterBlockReader&#x7C7B;&#x4E2D;&#xFF0C;&#x5B83;&#x7684;&#x4E3B;&#x8981;<strong>&#x529F;&#x80FD;</strong>&#x662F;&#x6839;&#x636E;&#x4F20;&#x5165;&#x7684;FilterPolicy&#x548C;filter&#xFF0C;&#x8FDB;&#x884C;key&#x7684;&#x5339;&#x914D;&#x67E5;&#x627E;&#x3002;
&#x5B83;&#x6709;&#x5982;&#x4E0B;&#x7684;&#x51E0;&#x4E2A;&#x6210;&#x5458;&#x53D8;&#x91CF;&#xFF1A;</p>
<pre class="language-"><code>const FilterPolicy* policy_; // filter&#x7B56;&#x7565;  

const char* data_;           // filter data&#x6307;&#x9488; (at block-start)  

const char* offset_;        // offset array&#x7684;&#x5F00;&#x59CB;&#x5730;&#x5740; (at block-end)  

size_t num_;                // offsetarray&#x5143;&#x7D20;&#x4E2A;&#x6570;  

size_t base_lg_;            // &#x8FD8;&#x8BB0;&#x5F97;kFilterBaseLg&#x5417;
</code></pre><p>Filter&#x7B56;&#x7565;&#x548C;filter block&#x5185;&#x5BB9;&#x90FD;&#x7531;&#x6784;&#x9020;&#x51FD;&#x6570;&#x4F20;&#x5165;&#x3002;&#x4E00;&#x4E2A;&#x63A5;&#x53E3;&#x51FD;&#x6570;&#xFF0C;&#x5C31;&#x662F;key&#x7684;&#x6279;&#x5224;&#x67E5;&#x627E;&#xFF1A;</p>
<pre class="language-"><code>bool KeyMayMatch(uint64_t block_offset, const Slice&amp; key);
</code></pre><h4 id="862-&#x6784;&#x9020;"><a name="862-&#x6784;&#x9020;" class="anchor-navigation-ex-anchor" href="#862-&#x6784;&#x9020;"><i class="fa fa-link" aria-hidden="true"></i></a>8.6.2 &#x6784;&#x9020;</h4>
<p>&#x5728;&#x6784;&#x9020;&#x51FD;&#x6570;&#x4E2D;&#xFF0C;&#x6839;&#x636E;&#x5B58;&#x50A8;&#x683C;&#x5F0F;&#x89E3;&#x6790;&#x51FA;&#x504F;&#x79FB;&#x6570;&#x7EC4;&#x5F00;&#x59CB;&#x6307;&#x9488;&#x3001;&#x4E2A;&#x6570;&#x7B49;&#x4FE1;&#x606F;&#x3002;</p>
<pre class="language-"><code>FilterBlockReader::FilterBlockReader(const FilterPolicy* policy, 
                                     constSlice&amp; contents)  

    : policy_(policy),data_(NULL), offset_(NULL), num_(0), base_lg_(0) {  

  size_t n = contents.size();  

  if (n &lt; 5) return;  // 1 byte forbase_lg_ and 4 for start of offset array  

  base_lg_ = contents[n-1]; // &#x6700;&#x540E;1byte&#x5B58;&#x7684;&#x662F;base  

  uint32_t last_word =DecodeFixed32(contents.data() + n - 5); //&#x504F;&#x79FB;&#x6570;&#x7EC4;&#x7684;&#x4F4D;&#x7F6E;  

  if (last_word &gt; n - 5)return;  

  data_ = contents.data();  

  offset_ = data_ + last_word; // &#x504F;&#x79FB;&#x6570;&#x7EC4;&#x5F00;&#x59CB;&#x6307;&#x9488;  

  num_ = (n - 5 - last_word) / 4; // &#x8BA1;&#x7B97;&#x51FA;filter&#x4E2A;&#x6570;
</code></pre><h4 id="863-&#x67E5;&#x627E;"><a name="863-&#x67E5;&#x627E;" class="anchor-navigation-ex-anchor" href="#863-&#x67E5;&#x627E;"><i class="fa fa-link" aria-hidden="true"></i></a>8.6.3 &#x67E5;&#x627E;</h4>
<p>&#x67E5;&#x627E;&#x51FD;&#x6570;&#x4F20;&#x5165;&#x4E24;&#x4E2A;&#x53C2;&#x6570;</p>
<ul>
<li>@block_offset&#x662F;&#x67E5;&#x627E;data block&#x5728;sstable&#x4E2D;&#x7684;&#x504F;&#x79FB;&#xFF0C;Filter&#x6839;&#x636E;&#x6B64;&#x504F;&#x79FB;&#x8BA1;&#x7B97;filter&#x7684;&#x7F16;&#x53F7;&#xFF1B;</li>
<li>@key&#x662F;&#x67E5;&#x627E;&#x7684;key&#x3002;
  &#x58F0;&#x660E;&#x5982;&#x4E0B;&#xFF1A;
  <code>bool FilterBlockReader::KeyMayMatch(uint64_t block_offset, constSlice&amp; key)</code>
  &#x5B83;<strong>&#x9996;&#x5148;</strong>&#x8BA1;&#x7B97;&#x51FA;filterindex&#xFF0C;<strong>&#x6839;&#x636E;</strong>index&#x89E3;&#x6790;&#x51FA;filter&#x7684;range&#xFF0C;<strong>&#x5982;&#x679C;</strong>&#x662F;&#x5408;&#x6CD5;&#x7684;range&#xFF0C;&#x5C31;&#x4ECE;data_&#x4E2D;&#x53D6;&#x51FA;filter&#xFF0C;&#x8C03;&#x7528;policy_&#x505A;key&#x7684;&#x5339;&#x914D;&#x67E5;&#x8BE2;&#x3002;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#xFF1A;</li>
</ul>
<pre class="language-"><code>uint64_t index = block_offset&gt;&gt; base_lg_; // &#x8BA1;&#x7B97;&#x51FA;filter index  

if (index &lt; num_) {  
  // &#x89E3;&#x6790;&#x51FA;filter&#x7684;range  
  uint32_t start =DecodeFixed32(offset_ + index*4);

  uint32_t limit =DecodeFixed32(offset_ + index*4 + 4);  

  if (start &lt;= limit&amp;&amp; limit &lt;= (offset_ - data_)) {  

    Slice filter = Slice(data_ +start, limit - start); // &#x6839;&#x636E;range&#x5F97;&#x5230;filter  

    returnpolicy_-&gt;KeyMayMatch(key, filter);  

  } else if (start == limit) {  

    return false;  // &#x7A7A;filter&#x4E0D;&#x5339;&#x914D;&#x4EFB;&#x4F55;key  

  }  

}  

return true; // &#x5F53;&#x5339;&#x914D;&#x5904;&#x7406;
</code></pre><p>&#x81F3;&#x6B64;&#xFF0C;FilterPolicy&#x548C;Bloom&#x5C31;&#x5206;&#x6790;&#x5B8C;&#x4E86;&#x3002;</p>
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